Study On Construction Method In Softrock Of Diaogouling Tunnel

The thesis linked with the construction of Diaogou Mountain tunnel in Wuhan-Guangzhou Passenger Line,and based on the analyse of construction method , the numerical analysis method and the monitoring theory, the construction method for the super large section tunnel in softrock are studied. The study work may be summarized as follows:1.The method of construction in softrock of diaogouling tunnel's exit is in progress than selections studies , that the method choosing the construction that the IV level surrounding rock and the V level surrounding rock adopt out parts for is: The IV level surrounding rock adopt three flight of steps method to be under construction , the V level surrounding rock adopt CRD method to be under construction.2.According to the numerical simulation of characters of repress- entative excavating and supporting, the relation among the variety of plastic range, internal force of preliminary support, deformation of cavern, progressing of excavating settlement of arch crown is studied. The excavating and supporting plan is reasonable from the result of the data processing.3.The excavating and supporting plan is whether reasonable or not is feedbacked by settlement of arch crown and convergence measure . At the same time, the reliability of numerical simulation is validated.This thesis is based on the tunnel in Newly-built (Wuhan-Guangzhou) Passenger Dedicated Line and it studies the reasonable construction method in Passenger Dedicated Line. Its achievement has been applied to engineering practice, resulting remarkable economic and social effects. It also provides similar projects with valuable experience.